Derivative Financial Instruments (Effect Of Cash Flow Hedges On Financial Statements) (Details) - Forward Starting Pay Fixed Swaps [Member] - Interest Expense [Member] - Cash Flow Hedging [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion Pretax Hedge Loss Recognized in Other Comprehensive (Loss) Income	$ (27.9)	$ (119.1)	$ (731.6)	$ (119.1)
Effective Portion Hedge Loss Reclassified from Accumulated Other Comprehensive Income	(1.4)	(1.4)	(4.3)	(4.1)
Ineffective Portion Hedge Loss Recognized	$ (7.7)	$ 0.0	$ (7.7)	$ 0.0